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  1. Dawson Sensenig

    Early/Middle Ordovician Brachiopods

    We recently found these brachiopods and I was wondering if anyone is able to provide any more information about who they are. They were collected on the Western cost of Newfoundland and they are early to middle ordovician in age. If you have any other questions regarding the fossils let me know and I will do my best to answer. Anything would help, thanks!
  2. Tales From the Shale

    Grant County Wisconsin- 7/7/23

    Age: Ordovician: Approx. 454-452 Mya Formation: Decorah Shale Location Grant County, Wi Amidst the frequent outcroppings of Platteville Limestone in Southern Wisconsin, you occasionally encounter the overlying Decorah Shale. From what I read this formation is more frequent north of Grant County, and in Minnesota as well. The outcrop itself is roughly 200 feet in length, and only extends about 6 feet from the ground. Its located in a very remote area, amongst a sea of corn fields. Here are a couple finds from my third trip to this locality. Here is a complete crinoid calyx with associated pinnule filtering appendages. Complete crinoids are much more common in Silurian/Devonian stratum. Next is a hashplate, with a few assorted brachiopods and crinoid fragments. There were also a handful of brachiopods to be found alone as well. All of these are very similar to the Ordovician Lepidocyclus perlamellosa/H. capax. Although these were much smaller in size. A single Lingula inarticulate brachiopod, which was a huge surprise since this was my first one ever. I found a mid sized orthoconic nautiloid. This one is 7 inches (17.7 cm) in length. The approximate width at its widest end is 2 3/4 (6.9 cm). Note the visible septa markings on the specimen. This is an internal mold, so structure is a little different from that of a normal mineralized specimen. Not the largest from this site, as others I've recovered push 25 inches (63.5 cm). The internal siphuncle is exhibited here in cross section: I marked the cross section and direction of the siphuncle here. Phragmocones from this locality only preserve as internal molds without any calcified structure. As a result of poor preservation they can be difficult to spot. With a trained eye, it becomes significantly easier. Here are some additional brachiopods that I dug out from this locality. A fennestellid bryozoan as well. There were a few, but none to write home about unfortunately. My favorite finds at this location are by far the large nautiloids, which have been consistently produced from here. (If only I could find one at 6 feet now ) If anyone has an i.d for that crinoid calyx, I'd be happy to post measurements or more detailed photos. Other than that I hope to run out to Indiana sometime within the month, maybe I'll see some of you out there. -Jonah
  3. Al Tahan

    New York Ordovician Jellyfish?

    I’m helping fellow forum member @DrDave move and we came across this piece he collected from the Whetstone Gulf formation a couple years back. My immediate thought was “holy ___ that’s a jellyfish!!” but I can’t say for certain but oh my gosh if it’s not a jelly then it’s done a wonderful job at looking like one lol. any thoughts from the folks here ??
  4. Seem to be two different group (I'm talking about the larger shells not Sowerbyella minnesotensis) but I'm not sure. Top rows appear to have wave like ripples described as Bellimurina charlottae. From Southeast Minnesota in solid beds of limestones associated with Decorah Formation. I wish I have one showing inside of shell hinges.
  5. Hey guys, I recently found this gastropod, which with help from the Forum I believe to be a Trochonema Umbilicatum. As I've looked at the rock more and more, I've noticed these shapes which look like they could be more individuals. I circled them from multiple angles, there appear to be 5 if I'm correct. I'm contemplating buying something like an airpen to reveal more, but I also don't yet have a lot of fossils that I would be able to use it on. Should I invest in an airpen or something similar to prep this and also have for future finds? If so, where would be a good place to find a good quality product at a reasonable price?
  6. Alexthefossilfinder

    Gastropod found next to my house

    While doing yard work I came across this rock sitting between my house and the neighbors. After walking past it a few times I flipped it over to find this gastropod, which is the largest and most well preserved I've found so far! I haven't found a genus or species yet, so feedback is highly appreciated, but I wanted to share it as a reminder as to what you can find even in your literal backyard
  7. Howdy! Last week, @KompsFossilsNMinerals and I were invited by Dan Cooper to go collect the Walcott-Rust Quarry this week, so today we both got up bright and early to make the trek out to the central Mohawk Valley for the day. After fueling up on some pancakes from Denny’s, we made the last leg of the trip to the site, which is far from easy to find or get back to! It wasn’t long before Chris and I had both found a nice crinoid calyx, and the day just kept getting better! I mainly surface collected in the piles of weathering rock around the quarry, while Chris and the rest of the guys worked to get down to and peel up some more chunks of the Ceraurus layer. I had heard that the site was pretty difficult at times, so my hopes of finding anything weren’t too high, but not one of us left home empty handed! Collecting at this site has been a dream of Chris and I’s, so this was such an amazing opportunity for us!!
  8. Kane

    Anacheirurus

    From the album: Trilobites

  9. Andúril Flame of the West

    A Foray Into the Ordovician

    For some time, I have been wanting to check out some of the lesser known formations that exist in my local area. The Devonian Mahantango Formation and the Needmore Shale are undoubtedly fun to explore and yield some beautifully preserved specimens - something that can be seen in a number of posts on this forum - but I still had the itch to collect from something a bit more obscure. That opportunity presented itself in the Ordovician limestones that expose intermittently in western northern Virginia. A small body of literature exists describing these formations and analyzing their fauna, particularly the silicified trilobites they are best known for, but they do not seem to be nearly as thoroughly explored as nearby Devonian formations. Armed with my trusty Estwing, an overly chipped chisel, and the hope of uncovering some silicified trilobites, I headed over to one of the better known Ordovician exposures in the Virginia area. This particular exposure is quite large and unique due to the different formations it exposes. The road cut begins beside a small stream (in which limestones can also be found) and is composed of large, white largely unfossiliferous limestone. This limestone represents either the New Market Formation or the Lower Lincolnshire limestone. As one moves rightward along the exposure, the white limestones continue for some time before grading into significantly darker limestones. These, which are part of the Upper Lincolnshire limestone, have been interpreted to represent the Taconic orogeny which took place in the Appalachian region during the latter part of the Ordovician period. The dark Upper Lincolnshire continues for an appreciable distance as one travels right until it eventually transitions to the Edinburg limestone. The Edinburg limestone, which is composed of alternating beds of limestone and shale, also represents a period of rather intense deposition caused by erosion of the mountains that had formed during the Taconic orogeny. The Edinburg limestone at the exposure appears white to dusky grey due to weathering, but, interestingly enough, when it is chipped, the true jet black coloration of the limestone is revealed. The sequence continues past the bounds of the road cut that I explored, with an exposure of the Martinsburg Formation - which is yet younger than the Edinburg formation - exposing not far from the road cut. Here are a few pictures I took of the road cut. Unfortunately I did not have a chance to take more pictures, and I am not exactly sure as to the specific formations each photograph depicts. I briefly explored the Upper and Lower Lincolnshire limestones, but I did not find much with regards to fossil content. Most of my exploration was focused on the layers of the Edinburg limestone, which I had heard were the most productive with regards to silicified trilobites. Unfortunately, I do not believe that I recovered any silicified trilobites from the exposure. However, I did manage to find some silicified brachiopods in varying states of preservation and a number of other interesting fossils that I have not been able to identify. Now, let's delve into some of the finds . Brachiopod 1: Brachiopod 2: Brachiopod 3: Brachiopod 4: Brachiopod 5: Brachiopod 6: This particular brachiopod previously had more of the (silica?) coating, though I believe I inadvertently removed it by treating the specimen with concentrated vinegar. I would not want this to happen to any other specimens, but Brachiopod 3 and some of the others would certainly look very nice if some more of the limestone/mineral coating could be removed. Would there be a way to do this without physical preparation techniques (I do not possess the proper equipment for this and even if I did, I would be afraid of ruining the fragile specimens)? Brachiopod 7: This was one of the best preserved brachiopods that I found, which was quite ironic since it happened to be exposed to the elements right on the surface of the limestone. The photographs are not the best and I can certainly take more if they are needed. Brachiopod 8: Brachiopod 10: There were more brachiopods uncovered... but I think that is enough for one post. Now for some interesting microfossil hashplates that I decided to keep. Hash 1: Under the Microscope: Hash 2: Hash 4 Here I have included some photographs of some specimens that I have not been able to readily identify. Any help in identifying what organisms they are and even what genus/species they could be would be greatly appreciated! Below each one I have included a tentative guess as to what each fossil is. Unknown 1: I believe that this may be a weathered brachiopod viewed from the inside of the shell. Unknown 2: An interesting feature of the limestone or perhaps a preserve fragment of an arthropod/trilobite carapace? Unknown 3: I would guess that this piece would have the same origin as the specimen pictured directly above. Unknown 4: Same as the previous two unknowns? Unknown 5: One of the larger and more interesting specimens that I found at the exposure. I am not at all sure what it is, though I would guess that it might be part of a graptolite or bryozoan. I'd be very curious to hear what others think about this specimen in particular. Unknown 6: Not at all sure what this is. To me it looks like it is a fossil, but it could very well be a mineral stain of some sort. Unknown 7: Upon first cleaning this specimen I thought that it might be a very weathered brachiopod. However, after inspection under the microscope it seems to me that it might simply be a mineral deposit or a geological feature. Unknown 8: An interesting piece of detritus found on the plate containing Unknown 5. Unknown 9: I would imagine that this is either an encrusting bryozoan, a sponge, or a fragment of trilobite cephalon. Unknown 10: Unfortunately I do not have a larger, better picture of this specimen. I will try to take another photograph of this one. I do believe that this might be some sort of fenestrate bryozoan. Although most of the specimens were smaller than those I am used to collecting, I was glad to have some interesting mysteries and to have the Ordovician represented in my collection. All of the micro photographs that I took were taken using a Celestron Microcapture Pro Microscope, which has been working phenomenally to view even some of the smallest fossils. I hope that you enjoy reading this post and I want to extend my gratitude in advance to any who help with identification of the specimens! (Edit: Not sure why these photographs keep appearing at the bottom of the post. Does anyone know how to fix this?)
  10. A few months ago, I stopped at a location exposing the Brainard Member of the Maquoketa, Ordovician. Fossils are not well preserved at this exposure, but occasionally a decent crinoid shows up. When splitting a piece of matrix from that days collections, this basal plate popped out. If fully exposed, it would measure roughly 4 cm across, making it much larger than I am used to seeing. I am suspecting it is Carabocrinus, but would like an opinion from someone much more versed in crinoids than I. Just after I found this, I was processing, the next rock contained a reddish cavity that I just thought was a vug. Iron oxide stains many fossils at this location. After just finding that large plate, my eyes came back to this rock and I suddenly saw it as a crinoid calyx. Am I exhibiting Pareidolia???? Or is this a large calyx?? Red dot is where the aboral cup's end would be. Blue dot is centered on what looks like a worn basal plate. Other pics also show a hint of this. Some linear structures are present inside the "calyx" as marked with the green dot.
  11. Alexthefossilfinder

    Unknown shape in chert, possibly Ceraurinus

    Here's something I found a few months ago. There are lots of bits of brachiopods which seem to have been preserved in their original perfect shape instead of the casts I usually find. It's what's on top of them that interests me. It looks like it could be a trilobite cephalon, if that's the case then the closest match I could find was Ceraurinus sp. I'm pretty sure I saw something to do with a crinoid that looked similar though I haven't been able to find it again. Any other ideas?
  12. Kane

    Ordovician sponges?

    While splitting upper Ordovician shales in Ontario, I encountered these and reasoned it was possible these were sponges (owing to the presence of what appear to be spicules). I have encountered sponges in the upper Ordovician limestones, but not in the shales. The solo specimen measures about 1 cm. The cluster piece contain specimens slightly smaller than that. Firstly, I just wanted to rule out these as simply artifacts of mineralization. If they are sponges, I was curious if anyone had a bead on their genus as sponges are well outside my wheelhouse.
  13. Kane

    Triarthrus rougensis

    From the album: Trilobites

  14. Kane

    Triarthrus rougensis

    From the album: Trilobites

    Will need prep. Nicely pyritized.
  15. Kane

    Triarthrus rougensis

    From the album: Trilobites

    Missing cheeks.
  16. Kane

    Triarthrus rougensis

    From the album: Trilobites

    Found on May 2023 dig.
  17. Kane

    Triarthrus rougensis

    From the album: Trilobites

    Found on May 2023 dig. U. Ordovician, Ontario.
  18. Kane

    Triarthrus eatoni

    From the album: Trilobites

    Found on May dig. U. Ordovician, Ontario.
  19. Hello y’all! On Sunday, my close friend@KompsFossilsNMinerals and I met up once again to do some collecting at La Familia quarry in search of some good trilobites, and as always, we didn’t leave empty handed! We hit a few different sections of the strata, and we managed to have some level of success at every spot we worked.
  20. Fullux

    Aegirocassis?

    I've been fascinated with Aegirocassis for a while now. The fact that a complex, giant filter feeder occured so many millions of years ago astonishes me. Its just such an alien animal. I've found little fragments of arthropod molts in the Drakes formation which belong to Isotelus. That got me wondering. What are the chances that instead of these all being from isotelus, that they're instead from another arthropod such as a eurypterid or ordovician radiodont. Another question I have is, does aegirocassis or a radiodont related to aegirocassis occur in any places other than morocco. The Drakes formation seems to have experienced a submarine landslide (don't quote me on this) and most to all of the fossils there are of creatures that were overtaken by said landslide. (Not entirely sure if this is true) But, what if there were such radiodonts like aegirocassis living in the Drakes formation but the only fossils we would find of them is molt fragments like the ones I've found that fell off of the animal and were buried in the sediment, instead of whole body fossils because they were able to escape this landslide. Though, I suppose the only way to confirm that such a radiodont lived in the Drakes would be to find an actual fossilized corpse of one. Really I just think this is a fun idea but it definitely would be cool if it is true.
  21. Taxonomy from Fossilworks.com. Synonym Ectenocrinus canadensis Billings 1857. Ectenocrinus simplex can be well recognized by its distinctive trimeric columnals. References: Hall, J. (1847). Containing descriptions of the organic remains of the lower division of the New York system (equivalent of the Lower Silurian rocks of Europe). Paleontology of New York 1:1-338. Titus, R. (1989). Clinal Variation in the Evolution of Ectenocrinus simplex. Journal of Paleontology Vol. 63, No. 1 (Jan., 1989), pp. 81-91. Warn, J. and Strimple, H. L. (1977). The disparid inadunate superfamilies Homocrinacea and Cincinnaticrinacea (Echinodermata, Crinoidea), Ordovician-Silurian, North America (Bulletins of American Paleontology, 72, 138 p. H. Alghaled (2019). An Upper Ordovician faunal assemblage from the Neuville Formation of Québec, including an exceptionally preserved soft bodied sea anemone, Paleocerianthus neuvillii n. sp., Université de Montréal. MSc. thesis.
  22. Denis Arcand

    Is this coral ?

    I found a unique fossil in the Ordovician formation, but I'm unsure if it's coral or something else. Any thoughts or suggestions?
  23. Thescelosaurus

    Decorah Shale enigma

    Hello, everyone; This is a hash plate from the lower Decorah Shale of St. Paul, Minnesota. The central item in the photos is a thin dark fossil with crenulated segments. It appears that the fossil forms a nearly complete perimeter, defining a cross-section that seems to be uninterrupted on the side in the block but pinched into a bilobe on the side facing away from the block (either natural or crushed into that shape from a cylindrical or oval cross-section). Where the lobes pinch there is what appears to be a sediment-filled longitudinal gap. The scale bar has colored alternating millimeters, so we're looking at something a few millimeters across. My immediate thought was that this is phosphatic, as it is preserved similarly to trilobite fragments in the same plate (and in the Decorah in general). I can rule out most of the common groups immediately based on the apparent composition and general shape (sponges, corals, bryozoans, brachiopods, mollusks, and echinoderms). Because of the similarity to trilobite preservation, I first thought arthropod, but it certainly doesn't appear to be trilobitic. Obviously it's not an ostracode. I have very little experience with eurypterids but it doesn't seem like them, either. The other thing I've been considering is a machaeridian worm fragment, which would explain the apparent longitudinal gap and bilobed cross-section, but that crenulation thing is curious. Would any of you have any thoughts on this object?
  24. JimTh

    Some ordovician oddballs

    Hi folks, I made a long trip to several sites yesterday and brought home a couple of oddballs. First up, from St. Leon, I think this is Tetradium. I've found it before at this site and had it id'd here, but this appears pyritized and a bit different, maybe a bit larger segments? Thoughts? Second, from Lawrenceburg. I thought this was a giant gastropod wrapped in bryozoan when I first found it, but now I think it's just a very snail-like bryozoan growth. Can you see the spiral? Also from Lawrenceburg, is this oddity. The crater thing in the middle. Looks a lot like a crinoid calyx seen from the bottom, but I've never seen a calyx like this from either of these ordovician sites. Has a very bryozoan like texture around the top, but then gets smooth as it goes down. I suspect this is also a really odd bryozoan growth, but tell me what you think. Finally, there is this thing. I've been really wanting to find an Isotelus, so when I saw this, well, I said some choice words. Apologies for no scale, this was perched pretty high up in the Lawrenceburg cut. It's still there, as I convinced myself it had to be something else and it was on a big slab. It was around 6-8" long from top to bottom in the photo. I actually brought home a partial one of these before, but never ran it down to figure out what it is. It has a very defined edge along the right, that has a small "bead" on it, if you will. (Bead like in woodworking, if that helps.) Thanks!
  25. Fullux

    Isotelus?

    I found these two pieces in the Drakes formation of Louisville, Kentucky a little while ago. I'm 85% sure that these are molt fragments from Isotelus maximus but needed a second opinion. One could argue that these are simply iron coatings on pebbles, but if you look at the second one, the "coating" dips down into the pebble, and is also mixed in with a few other fossils such as vinlandostrophia. Then again I could still be wrong, I have been before.
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